Mesh collider collision very spotty after upgrading project to 3.0

Unity Engine
1

In 2.6 my bullet casings, which are capsule colliders, collided perfectly fine with the level which is one single mesh collider. My level is at the moment just a bunch of cubes so I guess I could easily remove the mesh collider and add a bunch of box colliders instead, but my question is: “Why is this happening?”

What is different?

I’ve tried every setting, but nothing changes.

In 3.0 most of my casings will bounce and then fall through the floor, some will collide correctly, some will get stuck in odd angles in the floor and some will fall straight through. Probably 90% fail to collide properly. In 2.6 every single casing collided properly.

I’ve seen other threads on this issue, but they came to no conclusion and are pretty old.

2

Extra info and follow up question:

My level is not closed, i.e there is no outer walls on it, and I’m wondering if that matters? Would closing it up so the mesh collider gains some thickness have any effect? If that’s at all how it works. :slight_smile:

Also, my level is very simple, but I’m wondering if 15-20 box colliders combined are faster than a single mesh collider.